/*
 * @(#)ScrollablePicture.java	1.0 Apr 27, 2008
 *
 *	The MIT License
 *
 *	Copyright (c) 2008 Malachi de AElfweald <malachid@gmail.com>
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *	THE SOFTWARE.
 */
package org.eoti.swing;

import javax.swing.*;
import java.awt.*;

public class ScrollablePicture
		extends JLabel
		implements Scrollable
{
	protected int maxUnitIncrement;

	public ScrollablePicture(ImageIcon icon, int maxUnitIncrement)
	{
		super(icon);
		this.maxUnitIncrement = maxUnitIncrement;
	}

	public void setMaxUnitIncrement(int pixels)
	{
		maxUnitIncrement = pixels;
	}

	public Dimension getPreferredScrollableViewportSize()
	{
		return getPreferredSize();
	}

	public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)
	{
		int currentPosition = 0;
		if(orientation == SwingConstants.HORIZONTAL)
			currentPosition = visibleRect.x;
		else
			currentPosition = visibleRect.y;

		/**
	     * Returns the number of pixels needed to move in 'direction' to get to next tick
	     */
		if(direction < 0)
		{
			int newPosition = currentPosition - (currentPosition/maxUnitIncrement) * maxUnitIncrement;
			return (newPosition == 0)?maxUnitIncrement:newPosition;
		}else{
			return ((currentPosition/maxUnitIncrement) + 1) * maxUnitIncrement - currentPosition;
		}
	}

	public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction)
	{
		if(orientation == SwingConstants.HORIZONTAL)
			return visibleRect.width - maxUnitIncrement;
		else
			return visibleRect.height - maxUnitIncrement;
	}

	public boolean getScrollableTracksViewportWidth()
	{
		return false;
	}

	public boolean getScrollableTracksViewportHeight()
	{
		return false;
	}
}
